That's a good point about distortion. If it was going on a bike or something else that actually needed to be round, I would have done more to keep the backside up to heat. It's amazing how oval things can get when brazing something like this if it really needs to be round. I made a copy of the EVT dishing tool, and the center tube got pretty oval. I was trying to keep that from happening, but the center tube is short and the joints with the two chainstays are big. I went back and heated up the sides and that fixed it enough that I didn't have to make the end caps smaller.

I might delete this video later. It was mostly just practice making videos. And I desperately need to get my bike rack finished.

I was impressed by how much of an explosion I got when I lit the acetylene. Didn't even notice it in real time. No wonder my hearing is going bad.